My method is a little different from Michelle's, and both will work just fine!
I cut 8 different fabrics into "chunks" about 6" wide X WOF (width of fabric) to allow for shrinking during prewashing and distortion when starching.
From the washer, I spread them out on old beach towels and spray starched them and left them overnight to air dry.
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This morning I steam ironed them nice and flat and cut 3 strips 1" wide X WOF, and left the 4th strip untrimmed on one side. This will allow for any errors in my seam allowances!
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I arranged 4 stacks of strips making sure that each stack had 8 different fabrics.
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